Bhagavata Purana (9th / 10th Century)

"While Dhruva Maharaja was passing through space, he saw, in succession, all the planets of the solar system, and on the path he saw all the demigods in their vimanas showering flowers upon him like rain...
He traveled in that way through the various planets, as the air passes freely in every direction. Coursing through the air in that grand and splendid vimana, which could fly at will, he surpassed even the Devas."